Non-believers on the rise in Congress - Are we ready for an Atheist President?

According to Pew's report on religious composition of the 113th congress more people in Congress identified themselves as atheist, agnostic or none; it's still only 10 members however that's twice as many as the last Congress. It's also likely that the true number is much higher. Is this "Progress of a sort" as Hitch used to say? The same article claims atheists, agnostics and "nones" account for 20% of America now.

I still am skeptical (imagine that) that I'll see an openly atheist President in my lifetime. What do you all think - is America ready for an Atheistic President?